Unravelling the structural changes of periphyton in relation to environmental variables in a semilotic environment in the Sundarban eco-region, India

Gogoi, Pranab and Sinha, Archana and Tayung, Tasso and Naskar, Malay and Sarkar, S D and Ramteke, Mitesh H and Das, Sanjoy Kumar and Lohith Kumar, K and Suresh, V V R and Das, B K (2021) Unravelling the structural changes of periphyton in relation to environmental variables in a semilotic environment in the Sundarban eco-region, India. Arabian Journal of Geosciences, 14 (9). ISSN 1866-7538

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Official URL: https://link.springer.com/article/10.1007/s12517-0...
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The aim of this study was to understand the ecohydrological interactions of periphyton assemblages in a canal (Bishalakhi) located in the Indian Sundarban. Sixteen environmental variables and periphyton (scrapped from a known area of submerged natural substrates) were collected seasonally (pre-monsoon, monsoon, and post-monsoon) from three sampling stations between July 2017 and September 2018. Data was analyzed to determine periphyton diversity, abundance, spatiotemporal dynamics, and their relationship with environmental variables using R-software. Eleven environmental variables (water temperature, water depth, water velocity, specific conductivity, total alkalinity, salinity, Mg2+, PO4−P, TP, SiO4−Si, and transparency) showed significant difference (p<0.05) across seasons. In total, 74 taxa of periphyton under 42 genera and 6 taxonomic groups were recorded. Diatom dominated the periphyton community in terms of diversity and abundance. All the recorded periphytic groups positively correlated with PO4−P and transparency and negatively correlated with water velocity and water depth. Cyanophyceae and Chlorophyceae showed a negative correlation with specific conductivity. Canonical correspondence analysis between five environmental variables (specific conductivity, water velocity, Ca2+, total nitrogen, and dissolved oxygen) that explained 94.70% of the variation and species abundance resulted in three constrained canonical axes in order of CCA1 (0.99) > CCA2 (0.93) > CCA3 (0.93). The majority of the diatom (36 species) had a strong affinity with dissolved oxygen and total nitrogen. The water velocity and specific conductivity were found to influence the distribution of species (Phormidium sp., Ankistrodesmus falcatus, Diploneis sp., Synedra sp., Eunotia sp., and Nitzschia recta) in the canal environment. The results of this study advance the current understanding of the relationship between periphyton and its environment and may aid for better planning of periphyton-based aquaculture in the semilotic canals of Indian Sundarbans.

Item Type: Article
Uncontrolled Keywords: Periphyton assemblage, Environmental parameters, Canal Sundarbans
Divisions: CMFRI-Kochi > Mariculture
Subject Area > CMFRI > CMFRI-Kochi > Mariculture
CMFRI-Kochi > Mariculture
Subject Area > CMFRI-Kochi > Mariculture
Depositing User: Arun Surendran
Date Deposited: 02 Nov 2021 07:18
Last Modified: 02 Nov 2021 07:18
URI: http://eprints.cmfri.org.in/id/eprint/15454

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